Upon arrival customer told me that the air in the house has a musty smell to it. Took all doors off air handler and found bio growth growing on the primary drain and the wires of the blower. talk to customer about cleaning the air handler and wiping it down they get all bacteria from the unit and installed a pure air X which is a germicidal UV light. Customer agreed on work so I installed and cleaned out the air handler. After doing my investigation as well I found three supply ducts with holes in them from mouses. Talked to customer and gave her a price on replacing the three supply ducts. And gave customer quote to replace them. Do not recommend only replacing three I do recommend replacing all ductwork because it is in bad shape. Comfort adviser scheduled to come out 9/27/23 to give a quote on replacing all ductwork and supply and return Plenum. Recommend re-insulation the suction line and the condensate line with new insulation because mouses ate that as well in the attic Recom